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3x+6(3x+6)=141
We move all terms to the left:
3x+6(3x+6)-(141)=0
We multiply parentheses
3x+18x+36-141=0
We add all the numbers together, and all the variables
21x-105=0
We move all terms containing x to the left, all other terms to the right
21x=105
x=105/21
x=5
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